Chemical modification of chitin and chitosan 2: preparation and water soluble property of Nacylated or N-alkylated partially deacetylated chitins

N-Acylated partially deacetylated chitin (DAC-88) derivatives were prepared via ringopening reactions with various cyclic acid anhydrides in aqueous MeOH system. N-Alkylation of DAC-88 were also performed in aqueous MeOH with various aldehydes, monosaccharides, and disaccharides. The water solubility of N-acylated and N-alkylated chitosan derivatives at various pHs were studied.